- output more informative error messages in `js_parse_expect`.
The previous code was bogus:
```
return js_parse_error(s, "expecting '%c'", tok);
```
this was causing a bug on `eval("do;")` where `tok` is `TOK_WHILE` (-70, 0xBA)
creating an invalid UTF-8 encoding (lone trailing byte).
This would ultimately have caused a failure in `JS_ThrowError2` if `JS_NewString`
failed when converting the error message to a string if the conversion detected the invalid
UTF-8 encoding and throwed an error (it currently does not, but should).
- test for `JS_NewString` failure in `JS_ThrowError2`
- test for `JS_FreeCString` failure in run-test262.c
- add more test cases
JSValueConst was only used for the now removed CONFIG_CHECK_JSVALUE
build mode. It is kept around as an alias for JSValue in quickjs.h to
avoid breaking everyone's source builds but remove it everywhere else.
The default 256 kb stack is too small to run some of the test262 tests
when ASAN is enabled.
Double it to 512 kb and ensure threads created by quickjs have big
enough stacks.
Before this commit the output of the test262 step was only visible in
the web interface at the end of the test run. Now it prints a status
update every few seconds.
